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@auch tatea gattnt @ffice JOHN N. WRIGLEY AND GEORGE SMITH, OF NEWARK,NEW JERSEY. ASSIGNORS TO JOHN N. WRIGLEY, OF THE SAME PLACE.

Letters Patent No. 69,526, dated October 1, 1867.

IMPROVEMENT IN CUT-OIT VALVE-GEAR.

TO ALL WI-IOM IT MAY CONOERN:

Be vit known that we, Jenn N. WRIGLEY and Gnonen SMITH, of Newark, inthe county ot Essex, and State of New Jersey, have invented a new andimproved Steam-Valve and Valve Movement; and we do hereby declare thatthe following is a full, clear, and exact description thereof, whichwill enable others skilled in the art to make and use the same,reference being had to the accompanying drawings, forming'a part of thisspecification. I

This invention relates to a new and improved methodvof admitting steamto the cylinder of a steam engine, and it consists in vthe arrangementand operation of the cams on the wheel, the adjustable har, thebell-crank, and connecting-rod m, as will be hereinafter moreparticularly described.

Figui-, I' represents a side elevation of the valve-chest and the partsby which it is operated, with the governor in red lines.

Fig-ure 2 is a sectional detailedi view of the valve-chest, with thevalve in place, showing the internal *chamber and the ingress and egressapertures. Y

Similar letters of reference indicate corresponding parts.`

Arepresents the valve-chest, B the valve. C is an internal chamber castwithin the chest, within which the valve is operated. The valve isdouble, having two seats in the chamber C., as seen in the drawing.It.will be seen that the valve is balanced, or nearly so, when in itsseat, as the steam presses upon both sides, `hilt the upper valve beinggreater in area than the lower one, the tendency of the steam pressureis to keep it closed, but this difference in area may be very slight, sothat the valve may be operated with perfect ease. The steam enters thechamber of the chest at D, and is discharged therefrom through sectionof a pipe marked E. F represents the valve-rod or spindle. To this isattached a bent lever, G, which has its fulcrum on a stand, f, after themanner of an ordinary safety-valve, but instead of a weight, the leverhas a spiral spring, a, attached to it and to the flange of the pipe asseen in the drawing. This is for the purpose of securing a. quickclosing of the valve. The valve is operated by gear-wheels, which aredriven by the engine. H is the one through which the vulve is raised,upon the outer surface of which there are two cams, d d, firmly attachedto the wheel. The cogs on the opposite side of this wheel are seen indotted lines. A portion of the driving pinion-wheel is also seen in red.J is a hell-crank which is attached to and turns with a stud, z', and Kis an upright bar, which is attached to the outer end of the bell-crankJ, and it is connected with bent lever G bythe rod L. The rod L passesthrough the bar K, and-is adjustable on it. The other end of thebell-crank J is connected with the same lever Gr by the rod m. The endof this rod m is slotted, so as to make it adjustablefend it is fastenedand kept in place by a thumb-screw, n. By adjusting the rod m, by thisslot, on the lever G, the valve may be made to open, more or less, asthe position of the upright bar-K is governed in part thereby. The camsd d, on the wheel I-I, may be made adjustable, so as to give the barmore or less throw.

It will be seen that the upper endof this bar is inclined towards thecams, and that as lthe bar is raised the cams will move it outwardlyless than they do when it is lowered. In this way the valve is made avariable cut-off valve, and may be thereby set so as to discharge moreor less steam, as circumstances may require.

An arrangement (in red lines) is shown by which the governor of theengine is made to control the position of the bar K, thus making itself-adjusting. In this case the set-screwa is loosened, so that the rodmay play freely on the wrist at o.

It will be seenthat by this general arrangement, and with the balancedvalve operating as described, all extra cut-off plates or valves arerendered unnecessary, thus lcssening the expense and greatly improvingthe action of the steam engine, by rendering the motion steady anduniform under all circumstances.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is-

The cams d d on the wheel H, the adjustable bar K, the bell-crank J, andthe rod m, arranged and operating substantially as described for thepurposes set forth.

JOHN N. WRIGLEY,

GEORGE SMITH.

Witnesses:

WM. F. McNAMAnA, ALEX. F. ROBERTS.

